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DCPMM capacity could act as accessible persistent memory for applications or volatile system memory.
Based on the approximate percentage of DCPMM capacity invested in volatile system memory, the following
three operating modes are available for choice:
• App direct mode (0% of DCPMM memory acts as system memory):
In this mode, DCPMMs act as independent and persistent memory resources directly accessible by
specific applications, and DRAM DIMMs act as system memory.
The total displayed volatile system memory in this mode is the sum of DRAM DIMM capacity.
Notes:
– In App Direct Mode, the DRAM DIMMs that are installed can be configured to mirror mode.
– When only one DCPMM is installed for each processor, only not-interleaved App direct mode is
supported.
• Mixed memory mode (1-99% of DCPMM memory acts as system memory):
In this mode, some percentage of DCPMM capacity is directly accessible to specific applications (App
direct), while the rest serves as system memory. The App direct part of DCPMM is displayed as persistent
memory, while the rest of DCPMM capacity is displayed as system memory. DRAM DIMMs act as cache
in this mode.
The total displayed volatile system memory in this mode is the DCPMM capacity that is invested in volatile
system memory.
• Memory mode (100% of DCPMM memory acts as system memory):
In this mode, DCPMMs act as volatile system memory, while DRAM DIMMs act as cache. Only DCPMM
capacity is displayed as system memory in this mode.
The total displayed volatile system memory in this mode is the sum of DCPMM capacity.
DCPMM Management options
DCPMMs can be managed with the following tools:
• Lenovo XClarity Provisioning Manager (LEPT)
To open LEPT, power on the system and press F1 as soon as the logo screen appears. If a password has
been set, enter the password to unlock LEPT.
Go to UEFI Setup ➙ System Settings ➙ Intel Optane DCPMMs to configure and manage DCPMMs.
For more details, see
Note: If the text-based interface of Setup Utility opens instead of Lenovo XClarity Provisioning Manager,
go to System Settings ➙ <F1> Start Control and select Tool Suite. Then, reboot the system and press
F1 as soon as the logo screen appears to open Lenovo XClarity Provisioning Manager.
• Setup Utility
To enter Setup Utility:
1. Power on the system and press F1 to open LEPT.
2. Go to UEFI Settings ➙ System Settings, click on the pull-down menu on the upper right corner of
the screen, and select Text Setup.
3. Reboot the system, and press F1 as soon as the logo screen appears.
Go to System Configuration and Boot Management ➙ System Settings ➙ Intel Optane DCPMMs to
configure and manage DCPMMs.
https://sysmgt.lenovofiles.com/help/topic/LXPM/using_LXPM.html
.
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Chapter 6
Memory configuration
95
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